Japanese iPhone owners are being given the chance to bathe in the nostalgic glow of the old 3D View-Master -- only now, the pictures will actually move. The Sanwa device works in a similar manner to its ancient mechanical counterpart, but magnifies side-by-side yt3D YouTube movies on an iPhone instead of the classic circular slides. On top of negating the need for custom content like similarproducts we've seen, this should also yield a brighter and larger 3D viewing area than red-green glasses -- letting you get the most out of that retina display.